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Nissan Friend Me

A Friend Me concept car of Nissan is displayed during the media day of the IAA international motor show in Frankfurt, Germany, on Sept. 11, 2013.

Credit: JOHANNES EISELE/AFP/Getty Images

Audi Nanuk Quattro

The new Audi Nanuk Quattro is presented during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, on Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept. 22, 2013.

Credit: AP Photo/Frank Augstein

Audi Nanuk Quattro

The new Audi Nanuk Quattro is presented during a preview of the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, on Sept. 9, 2013.

Credit: AP Photo/Frank Augstein

Audi Nanuk Quattro

An Audi Nanuk Quattro concept car is presented at the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt, Germany, on Sept. 10, 2013.

Credit: DANIEL ROLAND/AFP/Getty Images

Audi Nanuk Quattro

A hostess stands next to an Audi Nanuk Quattro during the first press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, on Sept. 10, 2013.

Credit: AP Photo/Michael Probst

AP Photo/Frank Augstein

An Audi Nanuk Quattro concept car is presented at the international motor show in Frankfurt, Germany, on Sept. 10, 2013.

Credit: DANIEL ROLAND/AFP/Getty Images

Maserati Ghibli

A Maserati Ghibli is pictured at the Frankfurt Auto Show in Frankfurt, Germany, on Sept. 11, 2013.

Credit: DANIEL ROLAND/AFP/Getty Images

Lexus LF-NX

The Lexus LF-NX concept car is presented during the second press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, on Sept. 11, 2013.

Credit: AP Photo/Michael Probst

Jean Bugatti

The new Jean Bugatti is on display during the second press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, on Sept. 11, 2013.

Credit: AP Photo/Frank Augstein

Porsche 918 Spyder

Matthias Mueller, member of the board of directors for strategy of Porsche Automobil Holding SE and CEO of Porsche AG, presents the new 918 Spyder during a press conference on Sept. 10, 2013, at the international motor show in Frankfurt, Germany.

Credit: JOHANNES EISELE/AFP/Getty Images

Porsche 918 Spyder

Matthias Mueller, member of the board of directors for strategy of Porsche Automobil Holding SE and CEO of Porsche AG, presents the new 918 Spyder during a press conference on Sept. 10, 2013, at the international motor show in Frankfurt, Germany.

Credit: JOHANNES EISELE/AFP/Getty Images

Peugeot Onyx

The Peugeot Onyx concept car is on display during the second press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, on Sept. 11, 2013.